Colle di Val d'Elsa or Colle Val d'Elsa is a town and comune in Tuscany, Italy, in the province of Siena. It has a population of c. 20,000 (2005). Its name means "Hill of Elsa Valley", where "Elsa" is the name of the river which crosses it. Today, Colle di Val d'Elsa is internationally renowned for the production of crystal glassware and art, largely produced in the industrial lower town.
The village is entered through the ancient and monumental Porta Nova and winds its long and narrow way in a sequence of fine 16th-17th-century noble houses (notable are Palazzo Usimbardi, Palazzo Buoninsegni and the Town Hall) to the magnificent Palazzo Campana, which marks the entry to the Castle, the oldest part of Colle. Here, the atmosphere suddenly changes: narrow paved lanes, magnificent 15th and 16th-century noble houses (notable are Palazzo Luci, Palazzo Morozzi, Palazzo Giusti, Palazzo Dini), fascinating tower-houses (notable is the one where Arnolfo di Cambio was born).